ref: c881e33e8ed668f4d5a2102c113e3edb1ea80d44
dir: /sys/src/cmd/hg/templates/rss/filelog.tmpl/
{header}
<title>{repo|escape}: {file|escape} history</title>
<description>{file|escape} revision history</description>
{entries%filelogentry}
</channel>
</rss>